Hammer mill



Der. o. w. RANDOLPH 2,226,741 v HAMMER MILL Filed 001:. 24, 195.8 2 Sheets-Sheet 1 in; f/ fl/M P 4/75/71 /7 3 .o. w. RAND OLPH Q 2,226,741

HAMMER MILL 7 Filed Oct. 24, 1938 2 Sheets-Sheet 2 Z5 5 5 V if ''I :;.E' 3 I o i 23 w. 0 w 29 4% i? 5 a #9 j? Z Patented Dec. 1940 UNITED. STATES HAMMER MILL Oliver W. Randolph, Toledo, Ohio Application October 24, 1938, Serial No. 236,730

101mm; (else-11)- .position to bring enlargements 29 into abutting This invention relates to disintegrating or subdividing material. I

This invention has utility when incorporated in a hammer mill.

Referring to the drawings: a

Fig. 1 is a side elevation of an embodiment of the invention in an installation, for sub-dividing materials such ascereals or alfalfa;

Fig. 2 is a view in side elevation of the mill, parts-being broken away; r

on the line III-III, Fig. 1,-with the hammers radially thrown; Fig. 4 is a detail view of a'removable foraminous section;

Fig. 5 is a detail view of a swingable 'beater or bar; Fig. 6 is a transverse section of the millon the line VIVI, Fig. 3; a

Fig. 7 is a view of the fan or blower orithe line VII-VII, Fig. 3; and

Fig. 8 is a detail view of a replaceable abrader section and the portion of the mill from which it is taken.

Supply hopper I spills the material to be treated upon inclined screen 2 as agitated by motor 3. This efiects separation of flnes in receiver 4, thereby leaving the material to be treated to pass by chute 5. Wing valve 6 therein may be swung for effecting delivery from the chute 5 to duct I or to duct 8 as may be desired. These ducts near the lower portion have removable shutters 9 to permit inspection or ready access, as delivery therefrom is by port I0 (Fig. 3) into housing end ll carried by housing base l2 having lateral or outstanding flanges 13 on opposite sides mounting bearings l4 for shaft 15. This housing base I2 has bracket extensions l6 therefrom efiective to mount motor n, having coupling 18 directly with the shaft l5 (Fig. 2). Electric current supply lines I9, 20, extend to reversible switch 2| for effecting control of this motor l1 and reversing the direction of the motor driving action.

Between the housing ends I l at the upper portion is housing top section 22. Adjacent the termini of this section 22 and between the housing ends H are rods 23 adjusted and secured with respect to the end II by nuts 24. These rods 23 may be engaged by hooks 25 of housing sections 26 having abrading face portions 21 of selected degree of dimension for the serrations or teeththe smaller the teeth 21' the finer the subdivision. The sections 26 have handles 28 with which they may be rocked into hooked assembly Fig. 3 is a longitudinal section throughthe mill pebbles, metal, or foreign material, enter the port'32 and lodge'in the pocket '3l. k

The base l2 lower portion has thereacrossbar 33 having opposite parallel seats 34.- Forarriinous quadrant 35 may have terminus 36 enter a seat 34. This quadrant 35 has at'its opposite terminal an angular outward upper offset 31, with which coacts packing 38 for dust-tight'assembly with the section 26, secured at bolt holes 39, where bolts 40 not only pass from adjacent the chamber 31 through this flange 31 but engage flange in the base l2. 'It thus follows that there may be a full assembly of the cylindrical shell with the housing, which cylindrical shell has upper abrading portions 21, and therebelow quadrant foraminous portions 35 which may 'on one portion have openings 42 of a coarse dimension and adjacent section openings 43 of a fine or less dimension in keeping with the degree of subdivision eifected by the abrading portions 21.

On the shaft l5and in this housing ll, i2, 26,

approximately midway between the opposing,

Additionally, this stiffened disk has therethrough pins 46 engaging parallel mounting perforate support disks 4l. Mounted on these pins 46 between the disks 41 and toward the disk 44 in such a position as in swinging on the pins to clear the blades 45 of the fan, are'beaters 48. These heaters 48 have openings 49 and are spaced from each other by washers 66. The openings 49, being near opposite ends, permit these beaters of this hammer mill device to be reversed as free end corners wear down.

This housing base l2, being of larger arc than the foraminous portions 36, provides collector chamber 5| having outlet 62' connected by duct 53 axially of fan housing 64 in which is mounted radially bladed fan 55 on the shaft l5. In this fan exhaust housing 54, above the blade device 55 is located vane 56 which is automatically set, depending on the direction of rotation of the shaft l5, for cutting off downflow of the thrown or lifted disintegrated material. Adjacent this vane 56 is-upwardly extendinglduct II.

The selectively available delivery ducts I, I, to the rotary mill or beater permit, when the valve 6 is set for delivery to both thereof, simultaneous sub-division on each side of the disk 44. which sub-division may be to the same degree of fineness in the event the openings in the sections 35 are of similar size ineach of the sections thereof instead of being diil'erent sized ports 42, 43; If they be of the diiferent sizes, then sub division would of course have a wider range in the resultant product. This means that there may be one run through this hammer mill or beater at the coarse size and then the re-run through at the finer size; or one material may besupplied by duct 1 and a diflerent kind and the same or diiferent degree of fineness supplied through the duct 8. a

As the hammers or heaters 48 in their swing clear of the shell have their active termini worn down at one corner for one direction of rotation of the shaft IE, it is only necessary. to reverse the direction of drive of the motor I! by oppositely throwing the 'switch- 2|. As the two free corners are worn on the heaters 48 therods 48 may have cotter pins 8| removed and the beaters replaced end for end withthe parts re-assembled, followed by replacing of the cotter pins. There is thus a four-direction use for each of these beaters. The drive may run say i'lfior to 1800 R. P. M. This with a 125 horsepower motor may mean production at the rate of .four tons per hour for feed meal. At re-grindinl. 75 per cent to pass through No. 28 screen, three tons per hour may be ground with a '15 horsepower. If. 75 per cant be the proportion to pass through a No. 20 screen, two tons per hour may be ground with 50 horsepower when the substance is dried alfalfa. Lifting out of a section 26 permits change of the heaters ll on onerod 46 at a time without tearing down the mill.

Likewise. each section SI is accessible. for diiferent size substitution or replacement, elected by sliding such upward into the clearway provided by the removal of the adjacent section II.

In lieu of supply ducts I, I, at opposite-ends, a single medial supply duct ll (Fig. 8) may be adopted. e

The air pumping action through the mill by the blades ll, as supplemented by thefan ll, makes possible simultaneous additional feed mixing from one ormore further supply ways, such as duct It spilling into the duct" when its valve a is open. One or. more other feed ingredients, which may be p're-ground, may thus be automatically commingled to complete the deslredproduct conveyed for storing, packaging, or use, by the duct l'l.

Ports or openings II are in the disks l1,

- i What is claimed and itis desired to secure by Letters Patent is:

A material subdividing machine of the hammermill type comprising a housing having a top section and a base section, a horaontal shaft rotatably mounted in said housing, beater-supporting means carried by said shaft, beaters loosely pivoted on saidsupporting means, a pair of foraminousscreen sections ofarcuate form carried by the housing base section belowsaid shaft and concentricv therewith, said screen sections cooperatlng to form a generally semi-cylindrical screen. abar carried by'said housing base section and servingas an abutment in which the lower termini of said screen sec tions detachably seat. I said top *housingsection being generally ilxed' to said base housing section and being provided with opposed radially removable sections carrying abrading portions concentricv with said shaft and adapted to lock releasably said screen sections in operative position. a

OLIVER W. RANDOLPH. 

